07 and 08 are the same. 09+ models that have the 3.7L are slightly heavier and their springs account for this. The springs are interchangable but putting one on the other might increase/decrease the height by maybe .5in.

My box is in storage so I cannot confirm the part number for my swifts. i will say they are the best springs Ive ever had.

 

So do you have the G37x Swift springs or G35 coup Swift springs? I ask because your height and drop with your 19s on is exactly the look im going for!

 

if those are my only two options, its the G37X kit